When a complete arch of teeth is missing, or when few natural teeth remain, All-on-4 is one option for their replacement. The technique can require as few as four dental implants to hold a non-removable teeth bridge in position. Sometimes, we use more dental implants for increased strength and stability, but the overall technique remains the same. https://www.riversideoralsurgery.com/dental-implants/all-on-4-dental-implants/